简介：Morletwavelettransformationisusedinthispapertoanalyzethemultitimescalecharacteristicsofprecipitationdataseriesfrom1957to2005inGuyuanregion.Theresultsshowedthat(1)theannualprecipitationevolutionprocesshadobviousmultitimescalevariationcharacteristicsof1525years,712yearsand36years,anddifferenttimescaleshaddifferentoscillationenergydensities;(2)theperiodsatsmallertimescaleschangedmorefrequently,whichoftennestedinabiggishquasiperiodicoscillations,sotheconcretetimedomainshouldbeanalyzedifnecessary;(3)theprecipitationhadthreemainperiods(22year,9yearand4year)andthe22yearperiodwasespeciallyoutstanding,andtheanalysisofthismainperiodrevealsthattheprecipitationwouldbeinarelativehighwaterperioduntilabout2012.